Sectional chimney cap



3 Sheets-Sheet l G C ROBBINS SECTIONAL CHIMNEY CAP May 1, 1951 Filed Sept. 12, 1947 May 1, 1951 G. c. ROBBINS SECTIONAL CHIMNEY CAP 3 Sheets-Sheet 2 GROVER C. ROBBINS Filed Sept. 12, 1947 May 1, 1951 ROBBINS 2,551,292

SECTIONAL CHIMNEY CAP Filed Sept. 12, 1947 3 Sheets-Sheet 3 FIG-4 Elma/whom GROVER C. ROBBINS Patented May 1, 1951 UNITED STATES PATENT OFFICE 3 Claims.

a gale of wind blows across the top of a chimney,

there is a tendency for the chimney wall to deflect a portion of this wind downwardly into the flue and thus retard the upward draft. Sometimes, the down draft is sufficient to completely [overcome the upward draft, resulting in the chimney draft reversing its direction of travel and filling the room with smoke in which the fireplace connected with the chimney is located.

Various types of chimney tops have heretofore been used, but usually they are prefabricated to fit a given size of chimney and are not adaptable for fitting various sizes of chimneys except by making a chimney top for the specific size on which it is to be installed.

It is an object of this invention to. provide a chimney cap made in four corner sections and having filler sections adapted to be disposed between the corner sections, both on the sides and ends, if desired, so as to form a chimney top which can fit any size of chimney.

It is another object of this invention to provide a chimney cap so constructed that it can be fitted to any size of chimney and which will direct the outside currents of air upwardly when striking the chimney top, thereby to; assume an upward direction of travel which is parallel to the updraft current in the chimney flue and thus induce updrafts in the chimney flue.

It is another object, of this invention to .provide a chimney cap which is formed from a pair of flush-top telescopically disposed frustro-pyramidal members, said members having .::the proximate faces thereof spaced apart to provide an upwardly directed passageway for outside currents of air, with the outer members not extending downwardly as far as the inner members, thus to provide an opening for the entrance of the updrafts passing between the two members, all of said members being formed in sections, that is the four corner sections with filler members of any desired width adapted tov be disposed between the corner members, thus to provide a chimney top which can be fitted to any size of chimney. Preferably the corner sections and the intermediate filler members are provided with a plurality of coinciding holes so that the corner members can be moved relative to the intermediate filler members and securing means passed between coinciding holes to thereby secure the parts of the chimney cap in position to thus regulate its size to fit the top of any particular chimney, and at the same time to regulate the size of the inner wall of the chimney cap to coincide with the chimney fiu or lining.

Some of the objects of the invention having been stated, other objects will appear as the description proceeds when taken in connection with the accompanying drawings, in which I Figure 1 is an isometric view of a chimney cap showing it disposed on top of a chimney;

Figure 2 is a top plan view of the chimney p;

Figure 3 is a vertical sectional view through the chimney cap and a small portion of the top of the chimney and taken along the line 3--3 in Figure 2; V

Figure 4 is an isometric view of one of the corner sections;

Figure 5 is an isometric view of one of the intermediate filler sections.

Referring more specifically to the drawings, the numeral II] broadly indicates a chimney which is usually made of bricks II and usually has a terra-cotta member or tubular lining I2 therein. These chimneys when finished are usually capped over with a coating of cement mortar l3 which also is integral with the mortar l4 between the various bricks of the chimney. As a preliminary to the installation of my improved chimney cap, suitable vertically disposed holes are drilled through the layer of mortar i3 and extend into the bricks.

The chimney cap comprises broadly corner sections 15, I6, I! and I8 with intermediate connecting sections indicated at I9, 20, 2| and 2'2.

, A description of one corner section and one of the intermediate sections will be given and like reference characters will apply.

Each corner section comprises inner walls 30 and 3| disposed at right angles to each other and suitably secured as by welding to a corner plate 32. These inner walls 3 and 31 extend downwardly and flare outwardly and have a level por-' tion 34 adapted to rest on top of the mortar coating l3.

: The portions '34 have upturned flanges 33 along their outer edges. The members and 3| at their proximate ends are bent parallel to each other and are secured by any suitable means, such as welding, to a vertical partition 32. And to the outer edges of the vertical partitions 32 are welded outer members 36 and 31 which extend downwardly for a portion of the height of the corner members 32 and stop short thus leaving openings between the lower edges of the members 36 and 31 and the top edges of flanges 33.

The intermediate members or filler members which are secured between the corner members l5, l6, I1 and 8 are designated broadly by reference character 40 and comprise an inner wall or wall members 4| which extends all the way down and is bent outwardly at its lower end into a level portion 43 and has an upturned flange 44 on its outside similar to the flange 33 on the corner members.

Intermediate the ends of the member 4| is secured a Z-shaped member or rib 46 by welding or otherwise and to the outer edge of this Z- shaped member 46 is welded or otherwise secured an outer wall or wall member 41 which has approximately the same height as the outer wall member 36 of the corner portions. The lower end of this Z-shaped member 46 is suitably secured as by welding to the upper surface of flat portion 43.

The wall members 30 and 3! have a plurality of holes 50 therein and since the portions 30 and 3| overlap the intermediate wall portion 4 I, which also has a plurality of holes 42, a suitable bolt or screw 52 can be inserted between coinciding holes when the chimney cap has been adjusted to the proper size to hold the parts in assembled position. Likewise, the outer wall portions 36 and 31 have a pluralityof holes '53 therein which are adapted to coincide with suitable holes 51 in the outer wall members 41 and a suitable bolt or screw 55 can be inserted between coinciding holes to secure the corner and intermediate portions together.

The outer wall portions 41 of intermediate members 40 each have a row of spaced holes 51 therein which are adapted to be penetrated by the bolt or screw 55 to hold the intermediate members and the corner sections in assembled relation.

When the corner sections and intermediate se'ctions have been assembled to cause the chimney cap to have the proper outside dimensions, it is then ready for securing the same to the top of the chimney.

It will be noted that each of the inner walls 30 and 3| have holes therethrough near the base portion thereof and intermediate walls 4| have holes 6| near the base portion thereof and when the chimney cap is ready for installation; spots will be marked on the top of the chimney and suitable vertically disposed holes about to be referred to will be drilled. There will then be suitable L-shaped steel rods 64 dropped into these holes and. horizontal portion 64a, will pass through the holes 60 or 6i, as the case may be, and lie flush against the top surface of the base portions 34 or 43, as the case may be, and then a layer of cement mortar 65 will be poured on top of the chimney and portions of it will be disposed between the flanges 33 and 44 and the inner walls 30, 3| and 4|, as the case may be, and thus vwhen this cement mortar hardens, it will securely bind the chimney cap to the top of the chimney since some of the mortar 65 will flow down into vertically disposed holes around the vertically disposed legs of the member 64 and securely cement the same in position against dislodgement by gusts of wind and the like.

It is thus seen that the chimney cap can be assembled to fit various sizes of chimneys and preferably when it can be so adjusted, it will be slightly smaller than the outside of the chimney on which it rests, however, if such should be im- -possible, the chimney cap can be slightly larger than the top of the chimney and its outer lower edges can project outwardly beyond the chimney top if it is necessary. This provision takes care of chimneys having thin walls, that is, chimneys whose walls are only one brick thick. The outer edges of the cap base help to force the air up and prevent the air currents from escaping down the sides of the chimney.

In the drawings and specification there has been set forth a preferred embodiment of the invention, and although specific terms are employed, they are used in a generic and descriptive sense only, and not for purposes of limitation, the scope of the invention being defined in the claims.

I claim:

1. A chimney cap having walls forming a hollow frustro-pyramid comprising corner members each having right angular wings and filler members telescopically disposed between the corner members, each corner member and each filler member comprising inner and outer spaced walls secured to each other by an intervening rib member and providing a passageway therebetween, the inner wall extending from top to bottom of the member and resting on the top of a chimney, the rib for each corner member being disposed at the junction point of the right angular wings and extending downwardly the full length of the inner wall and forming a corner vane, the outer wall of each of the corner members and the filler members stopping short of the bottom and providing an opening through which outside air may pass upwardly between the inner and outer walls to create an upward draft within the interior portions of the chimney cap.

2. A chimney cap comprising a rectangle having end walls and side walls projecting upwardly and inwardly towards each other and providing a passageway upwardly therebetween, said passageway coinciding with the flue in a chimney, the corner portions of said chimney cap having outwardly projecting vertically disposed members extending for the length thereof, outer walls supported in spaced relation from the inner walls and projecting downwardly and outwardly for a portion of the height of the inner walls and providing an opening through which air may'flow upwardly between the inner and outer walls to create an updraft within the confines of the inner wall which coincide with the flue in the chimney, both the inner and outer side and end walls of said chimney cap comprising corner members and filler members telescopically disposed between the corner members and secured to each other to form the composite chimney cap and said filler members each having inner and outer wall members and a rib disposed between said inner and. outer wall members for holding the same in spaced relation to each other.

3. A chimney cap of hollow frustro-pyramidal shape comprising corner members secured to each other, each of said corner members having inner walls secured in right angular relation to each other, a rib disposed at the junction point of the right angular inner walls and extending downwardly the full length of the inner walls and outer walls secured in right angular relation to each other and secured at their junction point to said rib, said outer wall stopping short of the bottom of the inner wall, each of said filler members having an inner Wall member of the same vertical height as the inner walls of the corner members, a rib secured to the outer surface of said inner wall member and extending downwardly the full length thereof and an outer wall member secured to the rib member in spaced relation to said inner wall member, said outer wall member stopping short of the bottom of said inner wall member, whereby the corner members and filler members may be telescoped with 15 2,319,884

each other and means for securing said corner members and filler members together in adjusted position.

GROVER C. ROBBINS.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 638,172 Burress Nov. 28, 1899 671,483 J acobus Apr. 9, 1901 1,685,170 McDonald et a1 Sept. 25, 1928 Robbins May 25, 1943 

